He looks like he should be getting ready for his first Midnight Madness instead of his first game in the NBA. To say Frank Ntilikina has a baby face is like saying Dwayne “The Rock” Johnson has muscles. We might need to check Ntilikina’s I.D. just to prove he’s really 19 years old.

Ntilikina’s boyish looks and wide smile should play well on Madison Avenue if he amounts to anything at the Garden. The native of France and the Knicks’ first-round draft pick made his unofficial NBA debut Tuesday night during the Nets’ 115-107 victory over the Knicks in the first preseason game for both teams.

It was a glorified scrimmage as all preseason games will be until the season opener Oct. 19 at Oklahoma City. But all of these exhibitions are important for Ntilikina, who is being groomed as the point guard of the future, if not by November.

For now he’s an understudy to guards like Ramon Sessions, a 10-year veteran, and Tim Hardaway Jr., the former Knick-turned-current Knick. Every practice and every game is a teaching moment for someone the Knicks hope will be in their uniform into the next decade.

“When you’re young and only 19 and playing for the first time in the league, it’s going to be a whole new game for him,” coach Jeff Hornacek said.

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Here’s the early eyeball test on Ntilikina. First of all, he looks a lot like Isiah Thomas at first glance, wearing No. 11 and looking as if he should have the ball in his hands at all times. He isn’t nearly as flashy as his counterpart Tuesday night, Brooklyn’s D’Angelo Russell, who was burying 3-pointers and then glancing back to the crowd. Ntilikina’s game is much more understated. He scored five points with three assists in 18 minutes of playing time, feeling his way through his first game as if trying not to color outside the lines.

“He got us in the right sets and I thought he did a good job defensively,” Hornacek said. “I thought he did a good job for his first game.”

Ntilikina played just over nine minutes in the first half, operating like a traditional point guard always looking to run the offense and find the open man. If he was a bit tentative, you couldn’t blame him. Hornacek had told his Knicks before the game to play under control.

“You don’t have to show us anything individually,” he said. “Show us how you’re going to play as a team and help our team be the best we can.”

Ntilikina did that in baby steps. He was 1-of-3 from the floor in the first half, his lone bucket of the game coming on a 3-pointer in front of the Knicks bench. He also could have had more assists if Enes Kanter had converted two baskets off perfect passes dealt after Ntilikina penetrated the defense.

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“I think I can do better,” Ntilikina said after the game. “I’ll work on my game to be a lot more comfortable.”

In the second half, he was 0-for-4 from the field and seemed a bit lost as the Nets took control.

“He had some nerves,” Sessions said. “That’s to be expected. I’ve played 10 years and still get nervous. He looked timid at first but as he got more comfortable, he got more aggressive. I told him to stay aggressive and just do what he can do.”

There is still a lot to learn, but one thing Ntilikina has shown in training camp is that he’s a fast learner.

“He’s such a smart kid,” Hornacek said. “We don’t have to repeat things twice for him. We show it him one time and he’s got it. I think that’s going to translate for him. He’s going to gain a lot of knowledge from one game. I think he’s a smart player.”